I just got a pair of Deore disk hubs and noticed they didn't run too freely. They don't smooth up as they break in? Do you flush out the original grease, or just readjust the cones?

i just cleaned and repacked my front bearings (deore hub) after noticing that my front wheel was not running very freely at all. Everything was dirty, cleaned put it back together. Turns out i needed to adjust the cones, they were the culprit of the wheel friction. Rolling great now.

So Deore & XT both use loose ball bearing set-ups? Are there hubs out there using cartridge/ sealed bearings? Thanx

Deore & XT, neither have cartridge/sealed bearings. As far as those that do have that option, Hope, Chris King, XTR?, just look in the product description on your favorite website store, it'll tell you.